Installed software-properties-common to be able to use add-apt-repository

.gitea/workflows/ci-pipeline.yaml

@@ -20,12 +20,19 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Install pre-requisite packages
+      id: prereq
+      run: |
+        apt-get install software-properties-common
+        apt-get update
+
     - name: Install python3-venv
       id: install
       run: |
         add-apt-repository ppa:deadsnakes/ppa
         apt-get update
         apt-get install python3.11 python3.11-venv python3.11-pip -y
+      if: steps.prereq.outcome == 'success'
 
     - name: Check Python version
       run: |